TI-2026-45216 Aliases CVE-2026-63448

Suricata smb: some SMB flows can cause resource exhaustion

LOW 33CWE-400Published 2026-09-18 · Updated 2026-09-22

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.

Summary

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00447 39th percentileScored 2026-11-07

Fix Fixed suricata (OISF): 8.0.6, 7.0.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OISF	suricata	8.0.0 to before 8.0.6; before 7.0.17	8.0.6, 7.0.17	Patch available	CNA

suricata VendorOISF Affected 8.0.0 to before 8.0.6; before 7.0.17 Fixed in 8.0.6, 7.0.17 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:oisf:suricata::::::::	before 7.0.17; 8.0.0 to before 8.0.6	Vulnerable	OISF

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:* Versions before 7.0.17; 8.0.0 to before 8.0.6 Vulnerable ·OISF

Remediation

Fix · CNA suricata (OISF) Fixed in 8.0.6, 7.0.17

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-63448

References

Patch 6

Advisory 1

https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35

Other 3

TI-2026-33506 ikev2: unbounded client transform storage can lead to resource exhaustion CVSS 3.1HIGH 7.5
TI-2026-33484 Suricata lua/tls: null dereference in TlsGetCertInfo CVSS 3.1HIGH 7.5
TI-2024-31811 Suricata ja4: invalid alpn leads to panic CVSS 3.1HIGH 7.5
TI-2020-13673 Directory Traversal vulnerability found in Pfsense v.2.1.3 and Pfsense Suricata v.1.4.6… CVSS 3.1HIGH 7.5
TI-2023-17928 In Suricata before 6.0.13, an adversary who controls an external source of Lua rules may… CVSS 3.1CRITICAL 9.8
TI-2026-63304 Use after free in OISF Suricata CVSS 3.1CRITICAL 9.4

See all 99 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences